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   &#160;<span id="projectnumber">Version 2.7.1</span>
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<div class="header">
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<div class="title">Sample Use of Storage Driver<div class="ingroups"><a class="el" href="group__storage__interface__gr.html">Storage Interface</a></div></div>  </div>
</div><!--header-->
<div class="contents">
<p><b>Example Code:</b></p>
<p>The following is a generic algorithm to erase and program one <a class="el" href="group__storage__interface__gr.html#aac21d3f798c9fcad415b99cf4157935a">ARM_STORAGE_BLOCK_ATTRIBUTES::erase_unit</a> worth of storage and then read it back to be verified. It handles both synchronous and asynchronous driver implementations.</p>
<div class="fragment"><div class="line"><span class="comment">// Copyright (c) 2006-2016, Arm Limited, All Rights Reserved</span></div>
<div class="line"><span class="comment">// SPDX-License-Identifier: Apache-2.0</span></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="comment">// Licensed under the Apache License, Version 2.0 (the &quot;License&quot;); you may</span></div>
<div class="line"><span class="comment">// not use this file except in compliance with the License.</span></div>
<div class="line"><span class="comment">// You may obtain a copy of the License at</span></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="comment">// http:// www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="comment">// Unless required by applicable law or agreed to in writing, software</span></div>
<div class="line"><span class="comment">// distributed under the License is distributed on an &quot;AS IS&quot; BASIS, WITHOUT</span></div>
<div class="line"><span class="comment">// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div>
<div class="line"><span class="comment">// See the License for the specific language governing permissions and</span></div>
<div class="line"><span class="comment">// limitations under the License.</span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#include &quot;<a class="code" href="Driver__Storage_8h.html">Driver_Storage.h</a>&quot;</span></div>
<div class="line"><span class="preprocessor">#include &lt;stdio.h&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;string.h&gt;</span></div>
<div class="line"> </div>
<div class="line"><span class="preprocessor">#define TEST_ASSERT(Expr)                       if (!(Expr)) { printf(&quot;%s:%u: assertion failure\n&quot;, __FUNCTION__, __LINE__); while (1) ;}</span></div>
<div class="line"><span class="preprocessor"></span><span class="preprocessor">#define TEST_ASSERT_EQUAL(expected, actual)     if ((expected) != (actual)) {printf(&quot;%s:%u: assertion failure\n&quot;, __FUNCTION__, __LINE__); while (1) ;}</span></div>
<div class="line"><span class="preprocessor"></span><span class="preprocessor">#define TEST_ASSERT_NOT_EQUAL(expected, actual) if ((expected) == (actual)) {printf(&quot;%s:%u: assertion failure\n&quot;, __FUNCTION__, __LINE__); while (1) ;}</span></div>
<div class="line"><span class="preprocessor"></span> </div>
<div class="line"><span class="comment">// forward declarations</span></div>
<div class="line"><span class="keywordtype">void</span> callbackHandler(int32_t status, <a class="code" href="group__storage__interface__gr.html#ga3a9277f89946d61c41b22da72e3eef7c">ARM_STORAGE_OPERATION</a> operation);</div>
<div class="line"><span class="keywordtype">void</span> progressStateMachine(<span class="keywordtype">void</span>);</div>
<div class="line"> </div>
<div class="line"><span class="keyword">static</span> <span class="keyword">enum</span> {</div>
<div class="line">    NEEDS_INITIALIZATION,</div>
<div class="line">    NEEDS_ERASE,</div>
<div class="line">    NEEDS_PROGRAMMING,</div>
<div class="line">    NEEDS_READ,</div>
<div class="line">    NEEDS_VERIFICATION_FOLLOWING_READ,</div>
<div class="line">    FINISHED</div>
<div class="line">} state;</div>
<div class="line"> </div>
<div class="line"><span class="keyword">extern</span> <a class="code" href="group__storage__interface__gr.html#structARM__DRIVER__STORAGE">ARM_DRIVER_STORAGE</a> <a class="code" href="Driver__Storage_8h.html#af4ce245f055ef69edd1306ef8fde37cf">ARM_Driver_Storage_</a>(0);</div>
<div class="line"><a class="code" href="group__storage__interface__gr.html#structARM__DRIVER__STORAGE">ARM_DRIVER_STORAGE</a> *drv = &amp;<a class="code" href="Driver__Storage_8h.html#af4ce245f055ef69edd1306ef8fde37cf">ARM_Driver_Storage_</a>(0);</div>
<div class="line"> </div>
<div class="line"><span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">unsigned</span> BUFFER_SIZE = 16384;</div>
<div class="line"><span class="keyword">static</span> uint8_t buffer[BUFFER_SIZE];</div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">void</span> main(<span class="keywordtype">int</span> argc __unused, <span class="keywordtype">char</span>** argv __unused)</div>
<div class="line">{</div>
<div class="line">    state = NEEDS_INITIALIZATION;</div>
<div class="line"> </div>
<div class="line">    progressStateMachine();</div>
<div class="line">    <span class="keywordflow">while</span> (<span class="keyword">true</span>) {</div>
<div class="line">        <span class="comment">// WFE(); // optional low-power sleep</span></div>
<div class="line">    }</div>
<div class="line">}</div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">void</span> progressStateMachine(<span class="keywordtype">void</span>)</div>
<div class="line">{</div>
<div class="line">    int32_t rc;</div>
<div class="line"> </div>
<div class="line">    <span class="keyword">static</span> <a class="code" href="group__storage__interface__gr.html#structARM__STORAGE__BLOCK">ARM_STORAGE_BLOCK</a> firstBlock;</div>
<div class="line">    <span class="keywordflow">if</span> (!<a class="code" href="Driver__Storage_8h.html#a955b1ca2ea24cfd3a8923731b581cfd4">ARM_STORAGE_VALID_BLOCK</a>(&amp;firstBlock)) {</div>
<div class="line">        <span class="comment">// Get the first block. This block is entered only once.</span></div>
<div class="line">        rc = drv-&gt;<a class="code" href="group__storage__interface__gr.html#adda93f4d74519247517f036c4551dd13">GetNextBlock</a>(NULL, &amp;firstBlock); <span class="comment">// get first block</span></div>
<div class="line">        TEST_ASSERT_EQUAL(<a class="code" href="group__execution__status.html#ga85752c5de59e8adeb001e35ff5be6be7">ARM_DRIVER_OK</a>, rc);</div>
<div class="line">    }</div>
<div class="line">    TEST_ASSERT(<a class="code" href="Driver__Storage_8h.html#a955b1ca2ea24cfd3a8923731b581cfd4">ARM_STORAGE_VALID_BLOCK</a>(&amp;firstBlock));</div>
<div class="line">    TEST_ASSERT(firstBlock.<a class="code" href="group__storage__interface__gr.html#af931a8871310b4dad23f0f0b0f623560">size</a> &gt; 0);</div>
<div class="line"> </div>
<div class="line">    <span class="keywordflow">switch</span> (state) {</div>
<div class="line">        <span class="keywordflow">case</span> NEEDS_INITIALIZATION:</div>
<div class="line">            rc = drv-&gt;<a class="code" href="group__storage__interface__gr.html#a4a126668a113ce450b0d831c74199b23">Initialize</a>(callbackHandler);</div>
<div class="line">            TEST_ASSERT(rc &gt;= <a class="code" href="group__execution__status.html#ga85752c5de59e8adeb001e35ff5be6be7">ARM_DRIVER_OK</a>);</div>
<div class="line">            <span class="keywordflow">if</span> (rc == <a class="code" href="group__execution__status.html#ga85752c5de59e8adeb001e35ff5be6be7">ARM_DRIVER_OK</a>) {</div>
<div class="line">                TEST_ASSERT_EQUAL(1, drv-&gt;<a class="code" href="group__storage__interface__gr.html#abbfb3aa4b6adb4407de79221bf12cc55">GetCapabilities</a>().<a class="code" href="group__storage__interface__gr.html#a15ade4ca762bc6ce72d435a16febb4cc">asynchronous_ops</a>);</div>
<div class="line">                state = NEEDS_ERASE;</div>
<div class="line">                <span class="keywordflow">return</span>; <span class="comment">// there is pending asynchronous activity which will lead to a completion callback later.</span></div>
<div class="line">            }</div>
<div class="line">            TEST_ASSERT_EQUAL(1, rc); <span class="comment">// synchronous completion</span></div>
<div class="line"> </div>
<div class="line">            <span class="comment">// intentional fall-through</span></div>
<div class="line"> </div>
<div class="line">        <span class="keywordflow">case</span> NEEDS_ERASE:</div>
<div class="line">            TEST_ASSERT(firstBlock.<a class="code" href="group__storage__interface__gr.html#ade62c905888479b4f6d078d45cec5830">attributes</a>.<a class="code" href="group__storage__interface__gr.html#aac21d3f798c9fcad415b99cf4157935a">erase_unit</a> &gt; 0);</div>
<div class="line">            rc = drv-&gt;<a class="code" href="group__storage__interface__gr.html#abb5018d1afb3ea4632e6e6006314f37f">Erase</a>(firstBlock.<a class="code" href="group__storage__interface__gr.html#a0e89cf6b9f6cd3125470b1bed2b823df">addr</a>, firstBlock.<a class="code" href="group__storage__interface__gr.html#ade62c905888479b4f6d078d45cec5830">attributes</a>.<a class="code" href="group__storage__interface__gr.html#aac21d3f798c9fcad415b99cf4157935a">erase_unit</a>);</div>
<div class="line">            TEST_ASSERT(rc &gt;= <a class="code" href="group__execution__status.html#ga85752c5de59e8adeb001e35ff5be6be7">ARM_DRIVER_OK</a>);</div>
<div class="line">            <span class="keywordflow">if</span> (rc == <a class="code" href="group__execution__status.html#ga85752c5de59e8adeb001e35ff5be6be7">ARM_DRIVER_OK</a>) {</div>
<div class="line">                TEST_ASSERT_EQUAL(1, drv-&gt;<a class="code" href="group__storage__interface__gr.html#abbfb3aa4b6adb4407de79221bf12cc55">GetCapabilities</a>().<a class="code" href="group__storage__interface__gr.html#a15ade4ca762bc6ce72d435a16febb4cc">asynchronous_ops</a>);</div>
<div class="line">                state = NEEDS_PROGRAMMING;</div>
<div class="line">                <span class="keywordflow">return</span>; <span class="comment">// there is pending asynchronous activity which will lead to a completion callback later.</span></div>
<div class="line">            }</div>
<div class="line">            TEST_ASSERT_EQUAL(firstBlock.<a class="code" href="group__storage__interface__gr.html#ade62c905888479b4f6d078d45cec5830">attributes</a>.<a class="code" href="group__storage__interface__gr.html#aac21d3f798c9fcad415b99cf4157935a">erase_unit</a>, (uint32_t)rc); <span class="comment">// synchronous completion</span></div>
<div class="line"> </div>
<div class="line">            <span class="comment">// intentional fall-through</span></div>
<div class="line"> </div>
<div class="line">        <span class="keywordflow">case</span> NEEDS_PROGRAMMING:</div>
<div class="line">            TEST_ASSERT(BUFFER_SIZE &gt;= firstBlock.<a class="code" href="group__storage__interface__gr.html#ade62c905888479b4f6d078d45cec5830">attributes</a>.<a class="code" href="group__storage__interface__gr.html#aac21d3f798c9fcad415b99cf4157935a">erase_unit</a>);</div>
<div class="line"><span class="preprocessor">            #define PATTERN 0xAA</span></div>
<div class="line"><span class="preprocessor"></span>            memset(buffer, PATTERN, firstBlock.<a class="code" href="group__storage__interface__gr.html#ade62c905888479b4f6d078d45cec5830">attributes</a>.<a class="code" href="group__storage__interface__gr.html#aac21d3f798c9fcad415b99cf4157935a">erase_unit</a>);</div>
<div class="line">            rc = drv-&gt;<a class="code" href="group__storage__interface__gr.html#aedda6cc77ea7c4ef2356c683f9013d8b">ProgramData</a>(firstBlock.<a class="code" href="group__storage__interface__gr.html#a0e89cf6b9f6cd3125470b1bed2b823df">addr</a>, buffer, firstBlock.<a class="code" href="group__storage__interface__gr.html#ade62c905888479b4f6d078d45cec5830">attributes</a>.<a class="code" href="group__storage__interface__gr.html#aac21d3f798c9fcad415b99cf4157935a">erase_unit</a>);</div>
<div class="line">            TEST_ASSERT(rc &gt;= <a class="code" href="group__execution__status.html#ga85752c5de59e8adeb001e35ff5be6be7">ARM_DRIVER_OK</a>);</div>
<div class="line">            <span class="keywordflow">if</span> (rc == <a class="code" href="group__execution__status.html#ga85752c5de59e8adeb001e35ff5be6be7">ARM_DRIVER_OK</a>) {</div>
<div class="line">                TEST_ASSERT_EQUAL(1, drv-&gt;<a class="code" href="group__storage__interface__gr.html#abbfb3aa4b6adb4407de79221bf12cc55">GetCapabilities</a>().<a class="code" href="group__storage__interface__gr.html#a15ade4ca762bc6ce72d435a16febb4cc">asynchronous_ops</a>);</div>
<div class="line">                state = NEEDS_READ;</div>
<div class="line">                <span class="keywordflow">return</span>;  <span class="comment">// there is pending asynchronous activity which will lead to a completion callback later.</span></div>
<div class="line">            }</div>
<div class="line">            TEST_ASSERT_EQUAL(firstBlock.<a class="code" href="group__storage__interface__gr.html#ade62c905888479b4f6d078d45cec5830">attributes</a>.<a class="code" href="group__storage__interface__gr.html#aac21d3f798c9fcad415b99cf4157935a">erase_unit</a>, (uint32_t)rc); <span class="comment">// synchronous completion</span></div>
<div class="line"> </div>
<div class="line">            <span class="comment">// intentional fall-through</span></div>
<div class="line"> </div>
<div class="line">        <span class="keywordflow">case</span> NEEDS_READ:</div>
<div class="line">            rc = drv-&gt;<a class="code" href="group__storage__interface__gr.html#a79b015933daca07a88f98a8f20e1144d">ReadData</a>(firstBlock.<a class="code" href="group__storage__interface__gr.html#a0e89cf6b9f6cd3125470b1bed2b823df">addr</a>, buffer, firstBlock.<a class="code" href="group__storage__interface__gr.html#ade62c905888479b4f6d078d45cec5830">attributes</a>.<a class="code" href="group__storage__interface__gr.html#aac21d3f798c9fcad415b99cf4157935a">erase_unit</a>);</div>
<div class="line">            TEST_ASSERT(rc &gt;= <a class="code" href="group__execution__status.html#ga85752c5de59e8adeb001e35ff5be6be7">ARM_DRIVER_OK</a>);</div>
<div class="line">            <span class="keywordflow">if</span> (rc == <a class="code" href="group__execution__status.html#ga85752c5de59e8adeb001e35ff5be6be7">ARM_DRIVER_OK</a>) {</div>
<div class="line">                TEST_ASSERT_EQUAL(1, drv-&gt;<a class="code" href="group__storage__interface__gr.html#abbfb3aa4b6adb4407de79221bf12cc55">GetCapabilities</a>().<a class="code" href="group__storage__interface__gr.html#a15ade4ca762bc6ce72d435a16febb4cc">asynchronous_ops</a>);</div>
<div class="line">                state = NEEDS_VERIFICATION_FOLLOWING_READ;</div>
<div class="line">                <span class="keywordflow">return</span>;  <span class="comment">// there is pending asynchronous activity which will lead to a completion callback later.</span></div>
<div class="line">            }</div>
<div class="line">            TEST_ASSERT_EQUAL(firstBlock.<a class="code" href="group__storage__interface__gr.html#ade62c905888479b4f6d078d45cec5830">attributes</a>.<a class="code" href="group__storage__interface__gr.html#aac21d3f798c9fcad415b99cf4157935a">erase_unit</a>, (uint32_t)rc);</div>
<div class="line"> </div>
<div class="line">            <span class="comment">// intentional fall-through</span></div>
<div class="line"> </div>
<div class="line">        <span class="keywordflow">case</span> NEEDS_VERIFICATION_FOLLOWING_READ:</div>
<div class="line">            printf(<span class="stringliteral">&quot;verifying data\r\n&quot;</span>);</div>
<div class="line">            <span class="keywordflow">for</span> (<span class="keywordtype">unsigned</span> i = 0; i &lt; firstBlock.<a class="code" href="group__storage__interface__gr.html#ade62c905888479b4f6d078d45cec5830">attributes</a>.<a class="code" href="group__storage__interface__gr.html#aac21d3f798c9fcad415b99cf4157935a">erase_unit</a>; i++) {</div>
<div class="line">                TEST_ASSERT_EQUAL(PATTERN, buffer[i]);</div>
<div class="line">            }</div>
<div class="line">            state = FINISHED;</div>
<div class="line">            printf(<span class="stringliteral">&quot;done\r\n&quot;</span>);</div>
<div class="line">            <span class="keywordflow">break</span>;</div>
<div class="line"> </div>
<div class="line">        <span class="keywordflow">case</span> FINISHED:</div>
<div class="line">            <span class="keywordflow">break</span>;</div>
<div class="line">    } <span class="comment">// switch (state)</span></div>
<div class="line">}</div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">void</span> callbackHandler(int32_t status, <a class="code" href="group__storage__interface__gr.html#ga3a9277f89946d61c41b22da72e3eef7c">ARM_STORAGE_OPERATION</a> operation)</div>
<div class="line">{</div>
<div class="line">    (void)status;</div>
<div class="line">    (void)operation;</div>
<div class="line">    <span class="keywordflow">switch</span> (operation) {</div>
<div class="line">        <span class="keywordflow">case</span> <a class="code" href="Driver__Storage_8h.html#ga3a9277f89946d61c41b22da72e3eef7caca3985b874bf393dc2e448b339668971">ARM_STORAGE_OPERATION_INITIALIZE</a>:</div>
<div class="line">        <span class="keywordflow">case</span> <a class="code" href="Driver__Storage_8h.html#ga3a9277f89946d61c41b22da72e3eef7ca177812f3cb27c413473d94ebe9480454">ARM_STORAGE_OPERATION_READ_DATA</a>:</div>
<div class="line">        <span class="keywordflow">case</span> <a class="code" href="Driver__Storage_8h.html#ga3a9277f89946d61c41b22da72e3eef7ca586b4774a7a092d1932d3415cc42abb0">ARM_STORAGE_OPERATION_PROGRAM_DATA</a>:</div>
<div class="line">        <span class="keywordflow">case</span> <a class="code" href="Driver__Storage_8h.html#ga3a9277f89946d61c41b22da72e3eef7cab52a1d10b8087452fd97af8cdb9a6f75">ARM_STORAGE_OPERATION_ERASE</a>:</div>
<div class="line">            progressStateMachine();</div>
<div class="line">            <span class="keywordflow">break</span>;</div>
<div class="line"> </div>
<div class="line">        <span class="keywordflow">default</span>:</div>
<div class="line">            printf(<span class="stringliteral">&quot;callbackHandler: unexpected callback for opcode %u with status %ld\r\n&quot;</span>, operation, status);</div>
<div class="line">            <span class="keywordflow">break</span>;</div>
<div class="line">    }</div>
<div class="line">}</div>
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